code: def testGeneratedShardedFilenamesCommaWithShard(self):
      filenames = data.generate_sharded_filenames(
          "/foo/bar@3,/baz/qux@2"
      )
      self.assertEqual(
          [
              "/foo/bar-00000-of-00003",
              "/foo/bar-00001-of-00003",
              "/foo/bar-00002-of-00003",
              "/baz/qux-00000-of-00002",
              "/baz/qux-00001-of-00002",
          ],
          filenames,
      )
  
imports: import copy
  import tempfile
  import time
  from magenta.models.onsets_frames_transcription import configs
  from magenta.models.onsets_frames_transcription import constants
  from magenta.models.onsets_frames_transcription import data
  from note_seq import audio_io
  from note_seq import sequences_lib
  from note_seq import testing_lib
  from note_seq.protobuf import music_pb2
  import numpy
  import tensorflow.compat.v1
label_desc: Use image node_id 13 for calling the DataTest obj's underlying member method code with example usage: obj.testGeneratedShardedFilenamesCommaWithShard() without return types